Move form without Titlebar. no API needed

[nidhin.net]

Easily move form without using titlebar(border style=0) or you can click anywhere on the form to move it!!!.

Dim xx As Single
Dim yy As Single
Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    xx = X
    yy = Y
End Sub

Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
    If Button = 1 Then
        With Me
            .Left = .Left - (xx - X)
            .Top = .Top - (yy - Y)
        End With
    End If
End Sub

I found no drawbacks. Do you see anythig? .Please tell me